Scooby Doo MI: The New Girl

Ava Campbell recently moved to Crystal Cove with her older brother Alec. She ends up meeting the Mystery Incorporated gang when she enters her first day of High School. When she helped the gang solve a particular mystery, she is invited to join them in helping solve more mysteries in the future with her brother's approval knowing it'll be a fun experience for her. What they don't know however was that she knew more than they thought she did.